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2 votes
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Can Starship land on the moon horizontally?

Since the landing engines will be halfway up the body anyways, how about putting the landing legs to extend perpendicular and land with nose and main engine bay pointing towards their respective ...
Alonda's user avatar
  • 451
3 votes
0 answers
74 views

Will the last launch of the Delta rocket family cause changes to the liquid hydrogen supply chain?

This is a question from outside the StackExchange network that I'm reposting with permission from the original author. I honestly don't know if I think it's more likely to get answered here or on ...
Erin Anne's user avatar
  • 11.4k
13 votes
3 answers
1k views

Where can I get an earth-centric map of space?

Background. My best friend passed away last week. He's been working on the HUD for the new NASA spacesuit and has always been fascinated with space. I'm putting together his memorial service and ...
Tyler Murphy's user avatar
1 vote
0 answers
26 views

Simulating the thermal heating of a nose cone exiting an atmosphere

I have a simulation that describes a vehicle traveling at very high speeds (near or even above orbital) up out of the atmosphere and into space. I'd like to chart the rate of heating ($\dot{q}_{conv}$ ...
phil1008's user avatar
  • 4,556
1 vote
1 answer
87 views

How has rocket propulsion system designs developed over the years in terms of effectiveness?

I am working on a research project about developing rocket propulsion designs for school work. More specifically, I am researching how rocket propulsion designs have changed over the last century, in ...
Aryan's user avatar
  • 11
0 votes
0 answers
59 views

Pressure in tanks [closed]

I have this confusion about Pressure. Where does the pressure in the tank come from on a microscopic scale ? Is it just from the particles pushing against the surface and that's what the 1-2 bar ...
HNF's user avatar
  • 11
4 votes
1 answer
125 views

Structural Mass Fraction

In spacecraft design, when talking about the structural mass fractions, the NASA website gives the following equation: Source: https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/mass-ratios/ ...
G11's user avatar
  • 41
5 votes
1 answer
307 views

Would Starship do a direct descent into the atmosphere and aerobrake or do a capture burn before aero braking

Due to re-entry heating and the sheer velocity when coming in from solar orbit into the Earth's SOI, will Starship do a capture burn to slow it down before entering the atmosphere or just go for a ...
Lawn Hollander Lawn's user avatar
1 vote
0 answers
27 views

Has NASA published any information that better quantifies the mass budget requirements for "back to the moon ... this time to stay"?

I'm interested in those elements of their plans that will help me to estimate a yearly mass budget, such as how many crew at a time, how long will they stay each time, how often they will be rotated ...
phil1008's user avatar
  • 4,556
0 votes
0 answers
186 views

Is China on track for landing humans on mars? [closed]

Although China is still behind the US and even Russia in space technology, it is rapidly catching up. It has build its own space station, and has plans for a manned mission to the Moon. China has ...
Galerita's user avatar
  • 1,003
5 votes
1 answer
58 views

What does "Common frequency offset" plot means in gnss raw measurements?

I'm using Google's MATLAB code to analyze raw gnss measurement made with gnsslogger android app. In plots, there is one in particular that I don't understand the meaning, which is "Common ...
allexj's user avatar
  • 49
0 votes
0 answers
54 views

How does the X-59’s unique design contribute to reducing sonic booms during supersonic flight over land? [closed]

Quesst is NASA's mission to demonstrate how the X-59 can fly supersonic without generating loud sonic booms and then survey what people hear when it flies overhead. How does the X-59’s unique design ...
Spaceant's user avatar
8 votes
2 answers
807 views

How to determine the number of Multi Layer Insulation layers for a satellite?

I've been learning about Multi Layer Insulation (MLI) blankets for spacecrafts. I'm trying to figure out how to estimate the number of MLI layers that will be required at a particular orbit. MLI ...
Arjun Krishnan's user avatar
1 vote
0 answers
66 views

What is the ratio of air and ethyl alcohol that must be in order to power a rocket engine? [closed]

There is a rocket engine that will run on a fuel pair: air + ethyl alcohol, but what percentage of components should be supplied ...
DYNAMIC AEROSPACE's user avatar
2 votes
3 answers
4k views

Could SpaceX ever make a Heavy version of Starship Super Heavy

As of now, SpaceX is preparing for Starship Flight 4, and once starship is mature enough and achieves Elon Musk's goal, will they make a Heavy version like with Falcon. Even Before Integrated flight ...
Lawn Hollander Lawn's user avatar
24 votes
2 answers
4k views

What is the provenance of this photo of the Great Lakes from space?

My late grandfather owned this photo of the Great Lakes region: We don’t know where this photo is from or how he got it. He was a civilian engineer who worked closely with the Department of Defense ...
templatetypedef's user avatar
1 vote
0 answers
27 views

It is possible to perform a simplified version of rpo with GMAT?

I have one target vehicle and a chaser. How can I perform an orbit transfer with GMAT but, at the end of the transfer this finished maintaining a relative position of 1000 m behind the target and 1000 ...
Goku's user avatar
  • 11
5 votes
2 answers
147 views

Using Orbital Rings to Achieve High Escape Velocity

Hoping an astrophysics-calculation-competent person could help confirm this scenario: Say civilization has established an orbital ring around the Earth with an external launch track (using super-...
C. Burns's user avatar
  • 111
2 votes
1 answer
391 views

Shuttle dance bank angle timeline

I'm trying to see how much capacity the Shuttle had for reducing reentry temperatures by adjusting trajectory. So far, I've only been told then the Shuttle banks up to 80° during reentry. But is that ...
Abdullah is not an Amalekite's user avatar
0 votes
0 answers
51 views

How can I plot ground tracks on the surface of the Moon?

I'm curious if there's a module or Python library capable of plotting ground tracks on the Moon's surface, similar to how Skyfield or Astropy functions. I understand that Two-Line Elements (TLEs) are ...
ed190's user avatar
  • 53
5 votes
1 answer
570 views

How do you measure specific impulse Isp of a rocket engine?

Specific impulse (Isp), is one of the two most important parameters used to characterise a rocket engine. The other being thrust (T). For example, the RS-25 Space Shuttle Main Engine (SSME) has a ...
Galerita's user avatar
  • 1,003
7 votes
1 answer
804 views

Can the equipment behind panels of Russian ISS modules be reconfigured like the US modules?

I couldn't find any photos or information about how the Russian modules are configured inside the panels; RussianSpaceWeb's Nauka page has some articles that would likely help, but they're paywalled. ...
Dakota's user avatar
  • 145
4 votes
2 answers
223 views

Will a human mission to Mars require artificial gravity?

Elon Musk and SpaceX are planning a manned mission to Mars as early as 2029. The mission timeline is unclear, but one proposal (page 16) from SpaceX, which uses Hohmann transfer orbits for minimum ...
Galerita's user avatar
  • 1,003
3 votes
1 answer
284 views

Feasibility of landing all 3 Cores of the Falcon Heavy on Droneships [duplicate]

All of the Falcon Heavy launches up to now are either expending the Center core and landing the side boosters on land, or expending all of them (some examples: Falcon Heavy test flight, both boosters ...
Lawn Hollander Lawn's user avatar
1 vote
2 answers
114 views

Feasibility of landing Starship's Super Heavy booster on a droneship

Recently, after IFT 3 of Starship Super Heavy, I went to ponder: Can SpaceX land their Super Heavy boosters on Autonomous Spaceport Droneships to get extra performance. Currently, it separates with ...
Lawn Hollander Lawn's user avatar
1 vote
1 answer
77 views

How to find out details on which country owns how many GEO stationary orbital slots

I would like to know on the orbital slots information (GEO) of few select countries and their current status. Please suggest the right source for them.
Bharath Simha Reddy's user avatar
2 votes
4 answers
200 views

How can one terraform Mercury?

I have seen many people talk about terraforming Venus or Mars. How about Mercury? There is probably plenty of sun light there and I imagine that people could place a magnetic ring at the L1 point to ...
Divinator's user avatar
0 votes
1 answer
76 views

Landing Zones 1 and 2 in Cape Canaveral and yet launching from KSC?

On Google Earth, I saw Cape Canaveral and Kennedy Space Center (KSC) are separate sites. However, I do not understand why SpaceX lands it's boosters on LZ 1 and 2 at Cape Canaveral but launches them ...
Lawn Hollander Lawn's user avatar
0 votes
1 answer
145 views

How much deltaV would it take to launch from the top of mount Everest straight up then circularize at 200km once in space?

I realize there are several similar questions, but i didn't see mention of the amount of deltaV needed beyond saying there is a slight benefit that is more than offset by dozens of social/political/...
Rasip's user avatar
  • 33
0 votes
1 answer
114 views

Star Tracker Absolute Accuracy

Blue Canyon Technologies states their standard nano star tracker accuracy is about the cross-axis (6 arcsec) and boresight (40 arcsec). How do I calculate the absolute accuracy the star tracker would ...
v_space's user avatar
  • 113
0 votes
0 answers
21 views

Example using NASA GMAT to model a sounding rocket launch

I'm wondering if anyone has an example GMAT script that describes a sounding rocket launch and return. Not necessarily looking for high fidelity but just something that shows the parameters for a ...
Eric Smith's user avatar
4 votes
2 answers
160 views

Is it possible to change a satellite's eccentricity without changing semimajor axis (instantaneous maneuver paradigm)? What else needs to "give"?

I've been wondering whether it's possible to change a satellite's eccentricity without changing its semi-major axis. (I'm assuming instantaneous changes in velocity.) At first I thought that this ...
NeutronStar's user avatar
  • 1,049
3 votes
0 answers
98 views

How can I calculate the altitude my waterrocket will fly with a certain amount of pressure?

I am trying to calculate how high my waterrocket will fly before launching it at different pressure using the Tsiolkovsky rocket equation. However, I stumbled upon an issue since the altitude that it ...
The Rocket fan's user avatar
4 votes
1 answer
703 views

Why is this satellite's solar panel oscillating?

Watching this video 2024 solar eclipse shadow seen from space by satellites and space station of a satellite capturing video footage of moon's shadow on Earth during eclipse. The accelerated footage ...
user avatar
4 votes
1 answer
244 views

Unable to find Incident Report for aborted launch of first Shuttle flight

There is an amazingly well writen report on the aborted launch of the first(?) shuttle because the computers did not sync up. I remember reading this report and it being fascinating and prescient ...
Edgar H's user avatar
  • 143
4 votes
1 answer
194 views

Theoretical viability of a liquid rocket engine concept [closed]

[DISCLAIMER: I am an aerospace engineer undergrad and I do NOT want to build this. I wanted to come up with an alternative for the usual hypergolic mix so US military personnel would have one less ...
user avatar
1 vote
0 answers
36 views

Thrust Impulse graph for specific engine type

I've seen many graphs for nuclear, chemical and airbreathing engine. However I have not seen a good depiction of electric engines such as xenon ion engines, argon thrusters, lithium, etc. This ...
AnarchoEngineer's user avatar
22 votes
5 answers
8k views

What is SpaceX doing differently with their Falcon 9 so that it doesn't cost as much as the Space Shuttle?

SpaceX has been launching and reusing their Falcon 9 for very cheaply quite often. Even though it is quite revolutionary, it is isn't the first time a rocket has been reused. The Space Shuttle side ...
User1's user avatar
  • 351
1 vote
0 answers
46 views

Two line element. Change epoch to epoch year and Julian day fraction [duplicate]

How to do we change this epoch 29 sep 2010 18:32:00.000 to Julian day fraction. I know that the 10272 are the last digits of the year and the day but I want to know how do we get the Julian day ...
Chris's user avatar
  • 11
6 votes
2 answers
1k views

What are the parameters of the Voyager high-gain antenna?

The Voyager spacecraft have a 3.66 m diameter parabolic high-gain antenna. I've had a nose around NASA's archives but I can't find the exact geometry of the parabola; specifically the distance from ...
Dave Gremlin's user avatar
  • 2,891
2 votes
0 answers
23 views

Extract GPS navigation messages from a RINEX navigation file

As a hobby project, I want to implement methods from the "GPS Software Attack" paper, which involves modifying GPS navigation messages. With this goal in mind, I am looking for: Examples of ...
David Khosid's user avatar
18 votes
7 answers
7k views

Why do scientists use specialized units for distance when metric units are perfectly adequate?

Three super common measures in space distance are the AU, the parsec and the light year. Although I understand the origins of these units, it seems odd to me that we don't use use standard metric ...
Fraser Orr's user avatar
1 vote
0 answers
42 views

What is the order of magnitude of perturbing forces in a lunar orbit in relation to the orbital altitude?

Although there are many sources that compare the magnitude of perturbing forces in an Earth orbit (see for example the answer to this question), I haven't been able to find the same information for ...
Djembo's user avatar
  • 11
0 votes
0 answers
29 views

How do I programmatically change the GMAT Mission Sequence?

This is a niche technical question about using the GMAT API. After digging through all of the official GMAT documentation and videos, I finally decided to use my Java application as a script driver ...
Manny's user avatar
  • 578
2 votes
1 answer
87 views

Radial hyperbolic trajectories

Wikipedia informs me that In astrodynamics and celestial mechanics a radial trajectory is a Kepler orbit with zero angular momentum. Two objects in a radial trajectory move directly towards or away ...
Starfish Prime's user avatar
3 votes
1 answer
142 views

What are the likely issues and challenges in developing LTC: Coordinated Lunar Time?

In April of 2024, the US White House directed NASA to define a workable definition and operational plan for LTC: Coordinated Lunar Time. White House directs NASA to create time standard for the moon | ...
nealmcb's user avatar
  • 711
0 votes
0 answers
61 views

Can infrastructure for generating a protective artificial magnetic field around a planet also be used to propel nearby spacecraft?

This is an attempt at "...maybe you scientists whizzes can visualize what I'm talking about and explain it better." from this closed question. If a well-established colony on the Moon or ...
phil1008's user avatar
  • 4,556
2 votes
0 answers
64 views

What are some best practices for coding a satellite orbit propagator and ground track plotter?

I've seen interesting projects like this and I've been doing a decent amount of orbit propagation (numerically integrating state vectors, accounting for perturbations, etc.) in python and animating ...
gaharaz's user avatar
  • 21
1 vote
0 answers
39 views

Is anyone using TDRSS for tracking data?

The Tracking and Data Relay Satellite System (TDRSS), as the name suggests, is a space-based relay system for S-band data from other satellites or spacecraft. However, the "Tracking" in the ...
cms's user avatar
  • 388
1 vote
2 answers
340 views

What happened to the Atlantis Project?

I recently saw Isaac Arthur video part of the upward bound serious about tether rings. There he mentioned a project known as the Atlantis project which is trying to get a tethered ring built in real ...
The Rocket fan's user avatar

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